Feat/render math plugin - #399

Interesting, this renders locally but not deployed. Likely a CSP problem. I'll look into it.

So actually deploying the plugin (or rather mathjax loading from an external CDN) forces me to do an amount of CSP hole punching I'm not comfortable with.

So what do we do? I think math is an essential feature. It makes the post much nicer and more readable.

on https://viereck.ch/latex-to-svg/
you can convert your formula to a svg

If you set the color to #FFFFFF and download it you get something like this:

(this is an svg uploaded in my comment)

I also favored the manual SVG approach until I remembered that inline math typesetting is also quite desirable to have (and not as easy to do with images). I wish there was a server side solution for this (as it would be the most elegant in this case), but there isn't afaict.

@jclsn this works now (apart from rendering equations in the summary text, but thats a known upstream issue I don't want to look into).

Merged through #398